kuhar added a comment.

You can easily get CD by calculating the PostDominanceFrontier. LLVM implements 
a templated IDF (Iterated Dominance Frontier) construction.
A native implementation for llvm ir for reference, if you need:

- 
https://github.com/seahorn/seahorn/blob/deep-dev-5.0/include/seahorn/Analysis/ControlDependenceAnalysis.hh
- 
https://github.com/seahorn/seahorn/blob/deep-dev-5.0/lib/Analysis/ControlDependenceAnalysis.cc

Paper: R. Cytron, J. Ferrante, B. K. Rosen, M. N. Wegman, and F. K. Zadeck. 
Efficiently
computing static single assignment form and the control dependence graph. ACM
Trans. Program. Lang. Syst., 13(4):451–490, Oct. 1991.


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